/*
* file_do() is the protocol-specific function for the do-phase, separated
* from the connect-phase above. Other protocols merely setup the transfer in
* the do-phase, to have it done in the main transfer loop but since some
* platforms we support don't allow select()ing etc on file handles (as
* opposed to sockets) we instead perform the whole do-operation in this
* function.
*/
static CURLcode file_do(struct connectdata *conn, bool *done)
{
/* This implementation ignores the host name in conformance with
RFC 1738. Only local files (reachable via the standard file system)
are supported. This means that files on remotely mounted directories
(via NFS, Samba, NT sharing) can be accessed through a file:// URL
*/
CURLcode res = CURLE_OK;
struct_stat statbuf; /* struct_stat instead of struct stat just to allow the
Windows version to have a different struct without
having to redefine the simple word 'stat' */
curl_off_t expected_size=0;
bool fstated=FALSE;
ssize_t nread;
size_t bytestoread;
struct SessionHandle *data = conn->data;
char *buf = data->state.buffer;
curl_off_t bytecount = 0;
int fd;
struct timeval now = Curl_tvnow();
*done = TRUE; /* unconditionally */
Curl_initinfo(data);
Curl_pgrsStartNow(data);
if(data->set.upload)
return file_upload(conn);
/* get the fd from the connection phase */
fd = conn->data->state.proto.file->fd;
/* VMS: This only works reliable for STREAMLF files */
if( -1 != fstat(fd, &statbuf)) {
/* we could stat it, then read out the size */
expected_size = statbuf.st_size;
/* and store the modification time */
data->info.filetime = (long)statbuf.st_mtime;
fstated = TRUE;
}
/* If we have selected NOBODY and HEADER, it means that we only want file
information. Which for FILE can't be much more than the file size and
date. */
if(data->set.opt_no_body && data->set.include_header && fstated) {
CURLcode result;
snprintf(buf, sizeof(data->state.buffer),
"Content-Length: %" FORMAT_OFF_T "\r\n", expected_size);
result = Curl_client_write(conn, CLIENTWRITE_BOTH, buf, 0);
if(result)
return result;
result = Curl_client_write(conn, CLIENTWRITE_BOTH,
(char *)"Accept-ranges: bytes\r\n", 0);
if(result)
return result;
if(fstated) {
const struct tm *tm;
time_t filetime = (time_t)statbuf.st_mtime;
#ifdef HAVE_GMTIME_R
struct tm buffer;
tm = (const struct tm *)gmtime_r(&filetime, &buffer);
#else
tm = gmtime(&filetime);
#endif
/* format: "Tue, 15 Nov 1994 12:45:26 GMT" */
snprintf(buf, BUFSIZE-1,
"Last-Modified: %s, %02d %s %4d %02d:%02d:%02d GMT\r\n",
Curl_wkday[tm->tm_wday?tm->tm_wday-1:6],
tm->tm_mday,
Curl_month[tm->tm_mon],
tm->tm_year + 1900,
tm->tm_hour,
tm->tm_min,
tm->tm_sec);
result = Curl_client_write(conn, CLIENTWRITE_BOTH, buf, 0);
}
/* if we fstat()ed the file, set the file size to make it available post-
transfer */
if(fstated)
Curl_pgrsSetDownloadSize(data, expected_size);
return result;
}
/* Check whether file range has been specified */
file_range(conn);
/* Adjust the start offset in case we want to get the N last bytes
* of the stream iff the filesize could be determined */
if(data->state.resume_from < 0) {
if(!fstated) {
failf(data, "Can't get the size of file.");
return CURLE_READ_ERROR;
}
else
data->state.resume_from += (curl_off_t)statbuf.st_size;
}
if(data->state.resume_from <= expected_size)
expected_size -= data->state.resume_from;
else {
failf(data, "failed to resume file:// transfer");
return CURLE_BAD_DOWNLOAD_RESUME;
}
/* A high water mark has been specified so we obey... */
if (data->req.maxdownload > 0)
expected_size = data->req.maxdownload;
if(fstated && (expected_size == 0))
return CURLE_OK;
/* The following is a shortcut implementation of file reading
this is both more efficient than the former call to download() and
it avoids problems with select() and recv() on file descriptors
in Winsock */
if(fstated)
Curl_pgrsSetDownloadSize(data, expected_size);
if(data->state.resume_from) {
if(data->state.resume_from !=
lseek(fd, data->state.resume_from, SEEK_SET))
return CURLE_BAD_DOWNLOAD_RESUME;
}
Curl_pgrsTime(data, TIMER_STARTTRANSFER);
while(res == CURLE_OK) {
/* Don't fill a whole buffer if we want less than all data */
bytestoread = (expected_size < BUFSIZE-1)?(size_t)expected_size:BUFSIZE-1;
nread = read(fd, buf, bytestoread);
if( nread > 0)
buf[nread] = 0;
if (nread <= 0 || expected_size == 0)
break;
bytecount += nread;
expected_size -= nread;
res = Curl_client_write(conn, CLIENTWRITE_BODY, buf, nread);
if(res)
return res;
Curl_pgrsSetDownloadCounter(data, bytecount);
if(Curl_pgrsUpdate(conn))
res = CURLE_ABORTED_BY_CALLBACK;
else
res = Curl_speedcheck(data, now);
}
if(Curl_pgrsUpdate(conn))
res = CURLE_ABORTED_BY_CALLBACK;
return res;
}
/*
* file_do() is the protocol-specific function for the do-phase, separated
* from the connect-phase above. Other protocols merely setup the transfer in
* the do-phase, to have it done in the main transfer loop but since some
* platforms we support don't allow select()ing etc on file handles (as
* opposed to sockets) we instead perform the whole do-operation in this
* function.
*/
static CURLcode file_do(struct connectdata *conn, bool *done)
{
/* This implementation ignores the host name in conformance with
RFC 1738. Only local files (reachable via the standard file system)
are supported. This means that files on remotely mounted directories
(via NFS, Samba, NT sharing) can be accessed through a file:// URL
*/
CURLcode result = CURLE_OK;
struct_stat statbuf; /* struct_stat instead of struct stat just to allow the
Windows version to have a different struct without
having to redefine the simple word 'stat' */
curl_off_t expected_size = 0;
bool size_known;
bool fstated = FALSE;
struct Curl_easy *data = conn->data;
char *buf = data->state.buffer;
curl_off_t bytecount = 0;
int fd;
struct FILEPROTO *file;
*done = TRUE; /* unconditionally */
Curl_pgrsStartNow(data);
if(data->set.upload)
return file_upload(conn);
file = conn->data->req.protop;
/* get the fd from the connection phase */
fd = file->fd;
/* VMS: This only works reliable for STREAMLF files */
if(-1 != fstat(fd, &statbuf)) {
/* we could stat it, then read out the size */
expected_size = statbuf.st_size;
/* and store the modification time */
data->info.filetime = statbuf.st_mtime;
fstated = TRUE;
}
if(fstated && !data->state.range && data->set.timecondition) {
if(!Curl_meets_timecondition(data, data->info.filetime)) {
*done = TRUE;
return CURLE_OK;
}
}
if(fstated) {
time_t filetime;
struct tm buffer;
const struct tm *tm = &buffer;
char header[80];
msnprintf(header, sizeof(header),
"Content-Length: %" CURL_FORMAT_CURL_OFF_T "\r\n",
expected_size);
result = Curl_client_write(conn, CLIENTWRITE_HEADER, header, 0);
if(result)
return result;
result = Curl_client_write(conn, CLIENTWRITE_HEADER,
(char *)"Accept-ranges: bytes\r\n", 0);
if(result)
return result;
filetime = (time_t)statbuf.st_mtime;
result = Curl_gmtime(filetime, &buffer);
if(result)
return result;
/* format: "Tue, 15 Nov 1994 12:45:26 GMT" */
msnprintf(header, sizeof(header),
"Last-Modified: %s, %02d %s %4d %02d:%02d:%02d GMT\r\n%s",
Curl_wkday[tm->tm_wday?tm->tm_wday-1:6],
tm->tm_mday,
Curl_month[tm->tm_mon],
tm->tm_year + 1900,
tm->tm_hour,
tm->tm_min,
tm->tm_sec,
data->set.opt_no_body ? "": "\r\n");
result = Curl_client_write(conn, CLIENTWRITE_HEADER, header, 0);
if(result)
return result;
/* set the file size to make it available post transfer */
Curl_pgrsSetDownloadSize(data, expected_size);
if(data->set.opt_no_body)
return result;
}
/* Check whether file range has been specified */
result = Curl_range(conn);
if(result)
return result;
/* Adjust the start offset in case we want to get the N last bytes
* of the stream if the filesize could be determined */
if(data->state.resume_from < 0) {
if(!fstated) {
failf(data, "Can't get the size of file.");
return CURLE_READ_ERROR;
}
data->state.resume_from += (curl_off_t)statbuf.st_size;
}
if(data->state.resume_from <= expected_size)
expected_size -= data->state.resume_from;
else {
failf(data, "failed to resume file:// transfer");
return CURLE_BAD_DOWNLOAD_RESUME;
}
/* A high water mark has been specified so we obey... */
if(data->req.maxdownload > 0)
expected_size = data->req.maxdownload;
if(!fstated || (expected_size == 0))
size_known = FALSE;
else
size_known = TRUE;
/* The following is a shortcut implementation of file reading
this is both more efficient than the former call to download() and
it avoids problems with select() and recv() on file descriptors
in Winsock */
if(fstated)
Curl_pgrsSetDownloadSize(data, expected_size);
if(data->state.resume_from) {
if(data->state.resume_from !=
lseek(fd, data->state.resume_from, SEEK_SET))
return CURLE_BAD_DOWNLOAD_RESUME;
}
Curl_pgrsTime(data, TIMER_STARTTRANSFER);
while(!result) {
ssize_t nread;
/* Don't fill a whole buffer if we want less than all data */
size_t bytestoread;
if(size_known) {
bytestoread = (expected_size < data->set.buffer_size) ?
curlx_sotouz(expected_size) : (size_t)data->set.buffer_size;
}
else
bytestoread = data->set.buffer_size-1;
nread = read(fd, buf, bytestoread);
if(nread > 0)
buf[nread] = 0;
if(nread <= 0 || (size_known && (expected_size == 0)))
break;
bytecount += nread;
if(size_known)
expected_size -= nread;
result = Curl_client_write(conn, CLIENTWRITE_BODY, buf, nread);
if(result)
return result;
Curl_pgrsSetDownloadCounter(data, bytecount);
if(Curl_pgrsUpdate(conn))
result = CURLE_ABORTED_BY_CALLBACK;
else
result = Curl_speedcheck(data, Curl_now());
}
if(Curl_pgrsUpdate(conn))
result = CURLE_ABORTED_BY_CALLBACK;
return result;
}